A frictional sliding on a sprung slope (FSSS) device that axiomatically confers energy dissipation with re-centring to post-tensioned (PT) frames: A conceptual study

2021 ◽  
Vol 244 ◽  
pp. 112794
Author(s):  
Yichen Zhang ◽  
Raffaele De Risi ◽  
Nicholas Andrew Alexander
Keyword(s):  
Energy Dissipation ◽  
Frictional Sliding ◽  
Conceptual Study ◽  
Post Tensioned

scholarly journals Development Behavior for Post-Tensioned Self-Centering Steel Connection under Cyclic Loading

2017 ◽  
Vol 3 (3) ◽  
pp. 152-159
Author(s):  
Ahmadreza Torabipour ◽  
M. R. Shiravand
Keyword(s):  
Energy Dissipation ◽  
Numerical Models ◽  
Perfect Match ◽  
High Strength ◽  
Relative Displacement ◽  
Initial Stiffness ◽  
Validation Parameters ◽  
Steel Connection ◽  
Energy Dissipation Capacity ◽  
Post Tensioned

One of the newest steel beam-column joints to replace conventional welded connections, post-tensioned connection steel is with the upper and lower angles. In this connection are high-strength steel strands that parallel beam web and angles between beams and column. Actually high resistance strands and upper and lower angles respectively are provider centralization properties and energy dissipation capacity of the connection. The benefits of post-tensioned steel can be used in connection with the centralization and lack of relative displacement (drift) persistent, stay elastic core components such as connecting beams, columns and fountains connection, appropriate initial stiffness and joint manufacture with materials and traditional skills. . In this study, numerical modelling in Abaqus software, the results of the analysis were compared with the results of laboratory samples and the results showed that the two together are a perfect match. After validation, parameters influential centrist connection then pulled the thick angles in three numerical models were evaluated.  The results show that by increasing the thickness of the angles, increase energy dissipation capacity and ductility connection and the β₁ value does not experience tangible changes with changes in angle thickness.

SEISMIC BEHAVIOR OF POST-TENSIONED ROCKING COLUMNS WITH RE-PLACEABLE ENERGY DISSIPATERS

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
H. H. Hung ◽  
C. W. Huang ◽  
C. R. Jiang
Keyword(s):  
Energy Dissipation ◽  
Inelastic Deformation ◽  
Recovery Time ◽  
Seismic Behavior ◽  
Seismic Events ◽  
External Energy ◽  
Mechanical Joint ◽  
Bridge Column ◽  
Energy Dissipation Devices ◽  
Post Tensioned

To mitigate the column damage during seismic events and to reduce the recovery time after a major earthquake, a post-tensioned bridge column with a rocking interface above the foundation and externally-installed energy dissipation devices was proposed. The energy dissipation devices were specially designed to serve as fuse elements that can be easily replaced after yielding. In addition, a mechanical joint that can rotate freely in all directions was incorporated at one end of the dissipater to ensure bending was not transmitted into this device. To verify the seismic performance of the proposed system, two proposed specimens with different prestressing forces and design details in the rocking base were constructed and tested. From the experiments, it was found that the proposed post-tensioned specimens suffered minor damage after cyclic loadings. All of the damage was concentrated on the inelastic deformation that occurred at the external energy dissipaters. The ease of replacement for the external energy dissipaters was also confirmed.

ENERGY DISSIPATION IN POST-TENSIONED SELF-CENTERING PRECAST CONCRETE CONNECTIONS WITH A FRICTION DEVICE

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Takeaki Koshikawa
Keyword(s):  
Energy Dissipation ◽  
Friction Force ◽  
Precast Concrete ◽  
Design Parameters ◽  
Effective Energy ◽  
Energy Dissipation Capacity ◽  
Post Tensioning ◽  
The Moment ◽  
The Relationship ◽  
Post Tensioned

This paper presents an analytical study on the energy dissipation capacity of unbonded post-tensioned self-centering precast concrete beam-column connections that have a friction device only below the beam or on the web. The energy dissipation capacity is quantified using an effective energy dissipation ratio. To quantitatively evaluate the influence of three design parameters on the energy dissipation capacity, nonlinear analyses were carried out using a section-analysis method to predict the relationship between the moment and the relative rotation at the beam-column interface under cyclic loading. The design parameters were the initial post-tensioning force in the unbonded post-tensioning tendon, the friction force, and the location of the friction device. The analysis results show that the effective energy dissipation ratios for connections whose friction devices are in the same location can be related to the ratio of the friction force to the initial post-tensioning force.

Seismic design of hybrid unbonded post-tensioned precast concrete joints based on bearing capacity and energy dissipation capacity

2020 ◽  
pp. 136943322098273
Author(s):  
Baoxi Song ◽  
Weizhi Xu ◽  
Dongsheng Du ◽  
Shuguang Wang ◽  
Weiwei Li ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Bearing Capacity ◽  
Design Method ◽  
Precast Concrete ◽  
Residual Deformation ◽  
Time History ◽  
Frame Structure ◽  
Energy Dissipation Capacity ◽  
Concrete Joints ◽  
Post Tensioned

This paper provides a practical design method for hybrid unbonded post-tensioned precast concrete joints. Such joints featured with self-centering capacities have been widely favored in recent years. However, the absence of design methods hinders their further promotion. To solve the issue, two methods for calculating mechanical behavior of the joints were first studied: characteristic points method and iterative method. The effectiveness of the methods was verified by the existing test results. On this basis, a joint design method considering both yield bearing capacity and energy dissipation capacity was proposed. Moreover, to facilitate design, some factors affecting the bearing capacity were discussed. A five-story frame structure was designed by the proposed design method, and the influence of two design factors on structural response was analyzed by utilizing nonlinear time-history method. The analysis results show that: with the increase of energy dissipation factor αs, the post-earthquake residual deformation of the structure tends to increase linearly, while the accumulated damage of the structure will decrease continuously; both overdesign and underdesign of bearing capacity of the joint are unfavorable; and near-field earthquake may cause irreparable damage to structural columns, making the residual deformation of structures contrary to the self-centering capacity of joints, which shall be considered during engineering design.

Shaking table testing of post-tensioned timber frame building with passive energy dissipation systems

2017 ◽  
Vol 15 (10) ◽  
pp. 4475-4498 ◽  
Author(s):  
Antonio Di Cesare ◽  
Felice Carlo Ponzo ◽  
Domenico Nigro ◽  
Stefano Pampanin ◽  
Tobias Smith
Keyword(s):  
Energy Dissipation ◽  
Shaking Table ◽  
Timber Frame ◽  
Frame Building ◽  
Passive Energy Dissipation ◽  
Shaking Table Testing ◽  
Post Tensioned

An SMA cable-based negative stiffness seismic isolator: Development, experimental characterization, and numerical modeling

2022 ◽  
pp. 1045389X2110722
Author(s):  
Sasa Cao ◽  
Osman E Ozbulut ◽  
Fei Shi ◽  
Jiangdong Deng
Keyword(s):  
Energy Dissipation ◽  
Seismic Isolation ◽  
Large Scale ◽  
Experimental Testing ◽  
Force Balance ◽  
Negative Stiffness ◽  
Additional Energy ◽  
Sliding Bearing ◽  
Frictional Sliding ◽  
Residual Displacements

Shape memory alloy (SMA)-based seismic isolation systems can successfully reduce the peak and residual displacements of bridges during strong earthquake, but they commonly lead to an increased force demands in substructure. This study explores the development of an SMA cable-based negative stiffness isolator to alleviate this problem. The proposed isolator is composed of superelastic SMA cables and a frictional sliding bearing with convex surfaces. The frictional sliding bearing limit the forces transferred to the superstructure and provides energy dissipation, while its built-in negative stiffness mechanism reduces the force demands in substructure. SMA cables provide critical restoring forces, additional energy dissipation, and displacement-limiting capacity. Based on the force balance, the negative stiffness and restoring requirements of the SMA cable-based negative stiffness isolator were analyzed first. Then, a prototype large-scale isolator was designed and fabricated. Next, the experimental testing of the developed isolator was performed under two different vertical load levels. Finally, finite element modeling of the proposed isolator was conducted, and the simulation results and experimental results were compared and discussed. The proposed isolator generates lower forces than the SMA-based zero and positive stiffness isolators and can exhibit stable energy dissipation capabilities with very good displacement-limiting and self-centering capabilities.

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